use std::vec;

macro_rules! custom_print {
    ($str: expr) => {
        println!("{}", $str)
    };
}
// C风格的宏
macro_rules! 打印 {
    (()) => {
        println!("test")
    };
}

pub fn main() {
    custom_print!("Hello world!");
    let arr = vec![1, 2, 3];
    println!("{:?}", arr);
    打印!(());
}
